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REINFORCED CONCRETE (5mm, APPLICATION FILED JUNE 5,1919

1,318,870. Patented Oct. 14,1919.

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UNITED STATES PA ENT onnron.

JAMES EARLE HEBER, 0E WALKERVILLE, ONTARIO, CANADA, ASSIGNOB. T0.TRUSSED CONCRETE STEEL COMPANY OF CANADA, LIMITED, OF WALKERVILLE,ONTARIO,

CANADA, A CORPORATION.

REINFORCED-CONCRETE GIRDER.

Application filed June 5,1919. Serial No. euaoea' I To all whom it mayconcern:

Be it known that I, JAMns EARLE HEBER, a citizen of the United States,and residing at Valkerville, in the county of Essex and Province ofOntario, Dominion of Canada, have invented a new and ImprovedReinforced-Concrete Girder, of which the following is a specification.

This invention relates to the construction of reinforced concrete beamsand girders and its object is to provide a structural member which willcontain a minimum amount of concrete, cost of erection being considered.It further consists in a reinforced concrete floor carried by posts,which floor embodies a girder extending between posts, joists at anangle to the girder, and forms or tiles between the joists, the width ofthe girder between the ends of the forms adjacent the posts being lessthan its width at its middle portion, and a floor slab extending overthe forms and joists.

In the accompanying drawing, Figure 1 is a plan of a partly completedfloor. Figs. 2 and 3 are sections on the lines 22 and 33 of Fig. 1.

Similar reference characters refer to like parts throughout the severalviews.

In ordinary reinforced concrete floors supported primarily by means ofgirders extending between and integral with posts,

the girders are usually T-shaped in cross section and beamreinforcements are embedded in the bottoms of these girders andcantaliver reinforcements extend through the posts in those parts ofthegirders above the neutral axis which are subject to tension stresses.Such cantaliver reinforcements usually extend from the posts to justbeyond the line of contra-flexure.

In the drawings, the posts 1 are connected by girders 2 from which thefloor 3 extends laterally. On the section line-3-3 of Fig. 1, the girderis Tshaped, the depth of the head 4 of the T being that of the floor,the amount ofconcrete in the upper half of the beam being sufficient towithstand the crushing stresses above the neutral axis at the middle, ofthe girder, the tension stresses below the neutral axis being resistedby the reinforcing bars 5. This T-shaped structure extends each way fromthe middle of the girder about one-fourth its length to the line ofcontra-fiexure where it narrows doWn to the width shown in Fig. 2, andits tension zones above'the neutral axls are .re-

inforoed by the bars 6 which pass through the posts. The width of thehead of the girder at both the lines 2-2 and 33 may be determined by theforms 7 and the caps 8 over their ends. While these air-spaceforming-devices may be of any desired character, I prefer those shown inthe United States patent to Kane, No. 1,065,449, dated I June 24, 1913.

.Extending laterally between the forms 7 are concrete joists which arereinforced by means of tension bars 9 and 10 in the usual manner, thelatter extending across the girder above the neutral axis of the joists,and above these forms and connecting with the upper portion of thegirder are the slabs 12 of concrete.

For example, a girder twenty-seven inches deep supporting a twelve inchfloor and having a head thirty inches wide at the middle and forone-half its length may be twelve inches wide below the floor and nearthe tionate lessening of the load on the posts The saving of concreteand labor is enormous in large buildings without any loss of loadcarrying capacity.

The details and proportions of these gird- .ers and floor constructionsmay all be varied by civil engineers without departing from the spiritof my invention as set forth in the following claims.

I claim V 1. A reinforced concrete girder, and posts supporting the sameand integral therewith, said girder comprising a" concrete body which isT-shaped in cross section between lines of contra-flexure andrectangular for the remainder of its length, reinforcing rods lyingbelow the neutral axis of the girder, and other reinforcing rodsextendingfrom the posts into said girder above the neutral axis. I

2.. A reinforced concrete girder and posts supporting the same andintegral therewith, said girder comprising a concrete body which isT-shaped in cross section between lines of contra-flexure andrectangular for the remainder of its'len 'th; reinforcing rods lyingbelow the neutral axis of the girder, and other reinforcing rodsextending from the posts into said girder above the neutral axis, thewidth of the girder between the posts and the lines of contra-flexurebeing substantially the width of the lower portion of the T-shapedcentral portion of the girder.

3. A reinforced concrete floor construction comprising posts andcontinuous girders supported thereby, arallel lines of forms extendingfrom sale glrder, 101sts extending between the forms, and a slabextending over the forms and uniting the 15 JAMES EARLE HEBER.

Copies of this patent may be obtained for five cents each, by addressingthe Gommissioner of Patent Washington, D. O.

